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Interaction of digoxin with antihypertensive drugs via MDR1.

Abstract：

:The multidrug transporter MDR1 (P-glycoprotein)-mediated interaction between digoxin and 29 antihypertensive drugs of various types was examined by using the MDR1 overexpressing LLC-GA5-COL150 cells, which were established by transfecting MDR1 cDNA into porcine kidney epithelial LLC-PK1 cells. These cells construct monolayers with tight junctions, and enable the evaluation of transcellular transport. The MDR1 was highly expressed on the apical membrane (urine side). The basal-to-apical and apical-to-basal transcellular transport of [3H]digoxin in LLC-GA5-COL150 cells was time- and temperature-dependent. The basal-to-apical transport of [3H]digoxin was markedly increased, whereas the apical-to-basal transport was decreased in LLC-GA5-COL150 cells, compared with the host LLC-PK1 cells, suggesting that [3H]digoxin was a substrate for MDR1. Most of the Ca2+ channel blockers used here markedly inhibited basal-to-apical transport and increased apical-to-basal transport. Exceptions were diltiazem, nifedipine and nitrendipine, which hardly showed inhibitory effects on transcellular transport of [3H]digoxin. Alpha-blocker doxazosin and beta-blocker carvedilol also inhibited transcellular transport of [3H]digoxin, but none of the angiotensin converting enzyme inhibitors and AT1 angiotensin II receptor antagonists used here were active. These observations will promote understanding of the digoxin-drug interactions resulting from their actions on MDR1, and which may aid in avoiding these unexpected effects of digoxin.

journal_name

Life Sci

journal_title

Life sciences

authors

Takara K,Kakumoto M,Tanigawara Y,Funakoshi J,Sakaeda T,Okumura K

doi

10.1016/s0024-3205(01)01494-1

subject

Has Abstract

pub_date

2002-02-15 00:00:00

pages

1491-500

issue

13

eissn

0024-3205

issn

1879-0631

pii

S0024-3205(01)01494-1

journal_volume

70

pub_type

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